Teacherâs death in traffic collision renews calls for safety measures at intersection Teacherâs death in traffic collision renews calls for safety measures at intersection Friends and co-workers are mourning the death of 56-year-old Susan Guinee, a mother who was also a popular high school teacher. She was killed in a traffic collision on Crow Canyon Road in San Ramon last week. SAN RAMON, Calif. - Friends and co-workers are mourning the death of 56-year-old Susan Guinee, a mother who was also a popular high school teacher. She was killed in a traffic collision on Crow Canyon Road in San Ramon last week.